where \(\alpha _{\rm SSA}\)  is the optically thin spectral index. The fitted values for the normalization \(S_{\nu _0}\)  at 151 MHz, injection index \(a = 1 - 2 \alpha _{\rm SSA}\)  and optical depth \(\tau _{SSA}\)  at 151 MHz are listed in Table REF . From this fit, we also obtain the peak frequency (\(\nu _p\) ) and peak flux density (\(S_p\) ). Assuming a single homogenous emitting region of size \(\theta = 2\)  kpc (e.g. [1]}), the inferred magnetic field strengths are calculated using
\( B_{\rm SSA} \sim (\nu _p/8)^5 S_p^{-2} \theta ^4 (1+z)^{-1}\) 
